Post
Topic
Board Hardware
Re: BFL announces 28nm 600GH/S blade for $4680
by
PuertoLibre
on 18/08/2013, 00:18:49 UTC
This is hilarious... I actually have some BFL hardware and even I think this means they are finished..  They are obviously trying to move payments to a medium that cant be refunded (bitcoin or wire xfer).  They are using a design which alot of us *know* cannot dissipate that much heat, and they are moving at a snail's pace with current orders.

Guys... Ive never said this before, but i believe they are on the virge of folding and taking anyone who preorders money with them..

Regarding power consumption, Radeon 5970 and 5870 both consume more power than our card does, the very reason we took this design approach.

TDP of 5970 is 294W and 5870 is 224W.   The card is reported to be 350W which is significantly higher not lower.

Also this pretends away the challenges of the form factor and ignores it was AMD with three decades of experience delivering their 12th generation graphics card family.

AMD (ATI) first graphics card looked like this and consumed 10W.  Even AMD isn't immune to the challenges of working in a compact unforgiving form factor, the 7990 (375W TDP) was delayed by six months due to power/thermal issues that they found challenging to resolve.


While 350W is possible in that form factor one would have to be willing to bet that unlike every other time the simulations aren't lower than reality AND that the company doesn't run into any cooling or power problems due to the high energy density.   350W is 0.6 w/GH.  BFL current chips are 3.1 w/GH correct?  A die shrink generally cuts power consumption by 40% (you stated upthread or in another thread that it can be up to 60% but that would be rather optimistic don't you think?). 28nm is two die shrinks from current chip.  So 3.1 w/GH * 0.6 * 0.6 = 1.1 w/GH.  If the chips were identical with only a die shrink we would be looking at 1.1w/GH (660W for this card).  Now you did indicate you optimized the chip but that is a rather significant optimization wouldn't you say.  Nearly an 86% (1.1/0.6) improvement in performance per watt outside the die shrink.  Intel is happy for a 5% to 10% improvement in performance per watt (outside of die shrinks).

Given the aggressive improvement in performance per watt necessary, combined with the lack of any headroom (if it misses by even 20% then it can't be cooled in that form factor at that speed), it would need to be a nearly flawless design and execution from start to finish.   It certainly "can" be done but given BFL past promises on power and cooling well one would be betting that "this one will be different".  
LMAO, I had that video card. I didn't even know it was an ATI card. It was....EGA I think. Way back then....